Lithographic printing plate precursor and lithographic printing method

Abstract

A lithographic printing plate precursor comprising: a support; and an image recording layer containing (A) an infrared absorbing agent, (B) a polymerization initiator, (C) a polymerizable compound and (D) a compound having a carboxylate group and being removable with at least one of a printing ink and a fountain solution.

Description

FIELD OF THE INVENTION This invention relates to a lithographic printing plate precursor and a lithographic printing method using the same. More specifically speaking, it relates to a lithographic printing plate precursor whereby a plate can be directly made by scanning with infrared lasers from digital signals of a computer or the like, i.e., so-called direct plate making, and a lithographic printing method wherein the above-described lithographic printing plate precursor is developed on a printer followed by printing. BACKGROUND OF THE INVENTION In general, a lithographic printing plate consists of a lipophilic image part which receives an ink in the course of printing and a hydrophilic nonimage part which receives fountain solution. In lithographic printing, the lipophilic image part of a lithographic printing plate and the hydrophilic nonimage part thereof are employed respectively as an ink-receiving part and a fountain solution-receiving part (an ink-unrecieving part) by tak...

AI Technical Summary

Problems solved by technology

As a result, the ink unevenly adheres to the surface of the lithographic printing plate, i.e., the ink adheres exclusively to the mage part.

Accordingly, it is one of important technical problems to obtain a photosensitive lithographic printing plate appropriate for these systems.

In the case of applying the conventional image recording system with the use of ultraviolet to visible rays to the simplified plate making procedures such as the onboard developm

Images